KJ Works KP-13F Full Auto Metal Slide GBB CO2 Pistol (w/ Thread Barrel & Cap/ TAN) Barrel-Thread-Size-(mm)_33mm and made use of box

and made use of box magazines instead of drum magazines

Tokyo Marui 35rds Gas Magazine for M4A1 MWS

Hephaestus Stainless Steel Recoil Power Kit for Mauri Type 89 GBB

Design for Replace The Original Bolt Stop Plate

KJ Works KP-13F Full Auto Metal Slide GBB CO2 Pistol (w/ Thread Barrel & Cap/ TAN) Barrel-Thread-Size-(mm)_33mm and made use of boxKJ Works KP 13F Full Auto Metal Slide GBB Pistol (w Thread Barrel & Cap TAN) 1: 1 Ratio realistic gas blow back airsoft pistol (CO2) Gas Blow Back Pistol with Semi & Fully Automatic Shooting Mode Full Metal Slide & Polymer Frame Lower Frame with Under Rail 14MM CCW Threaded Outer Barrel Non Slip Textured Grip offer firm hold of pistol with gloves on Fiber Optic Front & Rear Sight Metal CO2 Magazine accommodate 23+1 Round 6mm airsoft plastic pellets